Tool holder



Nov. 26, 1935.

Tool. HOLDER Filed April 5, 19:54 f

n n 2 sheets-sheet 1 f K Nov. 26,1935. w KNA-PP- f 2,022,289 T Y TOOLHOLDER Y vFiled April 5, 193.4 2 Sheets-Sheet 2 Patented Nov. 2s, 1935UNITED *srA'rlss i PATENT.. .oi-ricevk v 2,022,289 y Toor. HOLDER WalterKnapp, Lancaster, Pa. Application April 5, 1934, serial' No. 719,111

" f 2 Claims. 143-6) F Many tool holders include in their constructionan arm mounted for rising and falling movement and for turning movementin a horizontal plane in respect to a vertical axis. In constructions,with which I am familiar, the vertical axis consisted of a standardmovable in respect to a fixed pedestal, and the arm was turnable in ahorizontal plane about the standard. This .construction required twojoints each having finished surfaces. The principal object of thepresent invention is to cheapen and improve the accuracy of such toolholders, and to this and other ends hereinafter set forth or appearingthe invention, generally stated, comprises a rigidly mounted standardhaving a single finished cylindrical joint surface, an arm having Vasingle finished cylindrical joint surface, said finished joint surfacesarranged in sliding and turning contact, and a hand operated lifting andlowering screw mechanism tumably mounted on top of the standard andconnected with the arm.

The invention also comprises the improvements to be presently describedand finally claimed. p

In the following description reference will be made to the accompanyingdrawings forming l part hereof and in which,

Figure 1 is an elevational view partly in section of a tool holderembodying features of the invention,

Figure 2 is a similar view drawn to an enlarged scale and illustrating amodiilcation.

Figure 3 is a transverse section taken on the line 3 3 in Fig. 1, and

Figure 4 is a view similar to Figure 1 illustrating anothermodification.

Referring to the drawings, and more particularly to Figure 1, I is astandard shown as of tubular form and it is rigidly mounted on apedestal 2. The standard I is provided with a single, finished,cylindrical, joint surface 3. 4 is an arm shown as provided at its loweredge with a rail i, and this arm 4 is provided with a single finishedcylindrical joint surface provided within the ring portion B of the armwhich surrounds the finished joint surface 3. The portion G of the armis shown as split and provided with a clamping means 'I by which it canbe secured to and released for movement in respect to the standard I.The arm 4 is provided with a slidable key 2l, which, by engaging splinesor elongated grooves 22, spaced forty-five degrees apart and provided inthe standard I ,serves to hold the arm 4 against turning in positionsspaced fortyve degrees apart for intermediate positions use is made ofthe clamp 1. The finished joint surfaces are arranged in slidingandhturning contact. The fact that there are but two nished jointsurfaces provides an economical construction and insures accuracy ofoperation. 8 is a second arm which is shorter than the arm 4 and it isprovided/with a threaded opening 9. The arm 8 is turnably mounted on thestandard I and, as shown it is connected to one element of an annularball bearing of which the other element is connected with the standard.The amount of `angular movement is indicated by pointer 25 and scale 26.As shown in Figure 1 a post III is mounted as a cap on the standard Iand the post is connected with the inner race of the ball bearing, theouter race of the ball bearing is connected with the arm 8 `and securedthereto by a plate II. As shown in Figure 2 the outer race of theannular ball bearing is connectedwiththestandard by a flange I2 `andplate I3. The inner race of the annular ball bearing is connected withthe arm 8 by a post I4. I5 is a screw which engages the"threaded opening9 in the arm 8 and itis provided at one end with a handle I6 and at theother end with a head I1 which is turnably mounted in the fitting I8applied to the top of the arm 4. I9 is a carriage slidable on the rail 5and from it depends the adjustable motor support 20 having pivotsarranged ninety degrees apart and provided with dial adjustments 20".

The purpose of the screw I5 is to raise and having grooves 22 spacedforty-five degrees apart for cooperation with the key 2|. The finishedcylindrical joint surfaces are arranged between thepost 24 and the splitring head 6. The screw I5 is mounted on the standard I, and the arm 8 isconnected by a bearing with the post 24 for turning but not for endwisemotion.

It will be obvious to those skilled in the art to which the inventionrelates that modifications may be made in details of construction andar'- rangement and in matters of mere form without departing from thespirit of the invention which is not limited in respect to such mattersor otherwise than es the prior art and the appended claims may require.

I claim:

1. A tool holder comprising in combination a rigidly mounted standardhaving a single nished cylindrical joint surface, an arm having a singlenished cylindrical joint surface, said iinished joint surfaces arrangedin` sliding and turning contact, a hand operated screw lifting andlowering mechanism mounted on vtop of the standard and turnablyconnected with the arm, and a removable key and its complemental spaansesplines interposed between the standard and arm.

2, In a machine of the type recited the combination of a standard, anarm, single nnished joint surfaces arranged in turning and'slidingcontact and provided respectively on the arm and standard, one of saidjoint surfaces being a clamp, and a removable key and its complementa]splines interposed between said surfaces, said splines spaced apart,whereby large adjustments are madeby the key and splines and inter-:mediate adjustments are made by the clamp.

WALTER KNAPP.

